Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.045A.

‘Aishah was asked about a pilgrim who has itching in his or her body. She said: “Yes, he or she may scratch as strongly as he or she likes.” This hadith is reported by Bukhari, Muslim and Malik, who added: “If both of my hands were tied, and only my leg was free, I would use it to scratch myself.” The same was reported from Ibn ‘Abbas, Jabir, Sa’id ibn Jubair, ‘Ata and Ibrahim An-Nakh’i.